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Sus (sometimes spelled "suss") is old, old slang, with two related main meanings.

The meaning that applies here is sus = suspicious/suspicion.

For example in the UK during the 1980s it was slang that someone was "arrested on suss" - meaning on suspicion of being up to no good, carrying stolen goods or drugs, going equipped for crime, being involved in a crime that happened, loitering with intent to commit a crime.... something like that.

The same word and meaning, was also used to refer to an object or action, as being suspicious, suspect, dodgy, or otherwise not to be taken at face value or given good faith. So whether a person joining a protest was a genuine protester or an infiltrator, whether something was an accident or deliberate, whether something happened in good or bad faith, whether the gift is really a gift or an enticing trap/trick...... "It's/They're suss" or "It's/They're a bit suss" (meaning "suspicious/suspect") covered all these shades.

So this is the meaning of your Facebook quote. The speaker is saying that people who joined Facebook after 2017 are suspicious/suspect in some manner - less likely to be seeking social media for the usual or traditional motives, or more likely to be dubious in some other manner. They need extra scrutiny as a rule, in a way that pre-2017 Facebook users usually don't need.

The other, related meaning, is most often seen in the phrases "sus(s) out" or "sussed/sussing out" or "sussed/sussing it". Meaning roughly, to have figured out or solved a conundrum, puzzling thing, problem, or anything else.

The connection to the first meaning is that the adjective something is sus(s) becomes used as a verb to suss, or to "suss out".

Once someone or something is "sus", the logical next step is trying to figure out whether it/they are in fact the dodgy and bad faith things that they are suspected to be. The process of working that out naturally in slang terms becomes "sussing out" or "sussing it out" and having an answer becomes "sussed (it) out".

• "People who drive Honda cars are definitely suss"
  (meaning roughly, in humour, the speaker is suggesting there's something wrong or dubious about the kind of person whom would choose to drive a Honda car)

• OP: "I ordered chicken and pineapple on my pizza."
  Friend: "Pineapple? Sounds sus to me, mate!"
  (in humour, joking at their friend's choice of topping)

Sus (sometimes spelled "suss") is old, old slang, with two related main meanings.

The meaning that applies here is sus = suspicious/suspicion.

In the UK during the 1980s, it was slang that someone was "arrested on suss" - meaning on suspicion of being up to no good, carrying stolen goods or drugs, going equipped for crime, being involved in a crime that happened, loitering with intent to commit a crime.... something like that.

The same word and meaning, was also used to refer to an object or action, as being suspicious, suspect, dodgy, or otherwise not to be taken at face value or given good faith. So whether a person joining a protest was a genuine protester or an infiltrator, whether something was an accident or deliberate, whether something happened in good or bad faith, whether the gift is really a gift or an enticing trap/trick...... "It's (or They're) suss" or "It's (They're) a bit suss" (meaning "suspicious/suspect") covered all these shades.

So this is the meaning of your Facebook quote. The speaker is saying that people who joined Facebook after 2017 are suspicious/suspect in some manner - less likely to be seeking social media for the usual or traditional motives, or more likely to be dubious in some other manner. They need extra scrutiny as a rule, in a way that pre-2017 Facebook users usually don't need.

The other, related meaning, is most often seen in the phrases "sus(s) out" or "sussed/sussing out" or "sussed/sussing it". Meaning roughly, to have figured out or solved a conundrum, puzzling thing, problem, or anything else.

The connection to the first meaning is that the adjective something is sus(s) becomes used as a verb "to suss", or to "suss out".

Once someone or something is "sus", the logical next step is trying to figure out whether it/they are in fact the dodgy and bad faith things that they are suspected to be. The process of working that out naturally in slang terms becomes "sussing out" or "sussing it out" and having an answer becomes "sussed (it) out".

• "People who drive Honda cars are definitely suss"
  (meaning roughly, in humour, the speaker is suggesting there's something wrong or dubious about the kind of person whom would choose to drive a Honda car)

• OP: "I ordered chicken and pineapple on my pizza."
  Friend: "Pineapple? Sounds sus to me, mate!"
  (in humour, joking at their friend's choice of topping)

(It can mean "suspect" but only as an adjective such as "that document is suspect, it could be a forgery", never as a noun "John is a suspect in a robbery")

And some examples where it simply means "to work out or solve a thing":

(It can mean "suspect" but only as an adjective meaning suspicious/dubious such as "that document is suspect, it could be a forgery", never as a noun "John is a suspect in a robbery")

And some examples as a verb,where it simply means "to work out or solve a thing":

The meaning that applies here is sus = suspicious/suspicion/suspect(ed). For example in the UK during the 1980s it was slang that someone was "arrested on suss" - meaning on suspicion of being up to no good, carrying stolen goods or drugs, going equipped for crime, being involved in a crime that happened, loitering with intent to commit a crime.... something like that.

The connection to the first meaning is that the noun sus(s) becomes used as a verb to suss, or to "suss out".

The meaning that applies here is sus = suspicious/suspicion.

(It can mean "suspect" but only as an adjective such as "that document is suspect, it could be a forgery", never as a noun "John is a suspect in a robbery")

For example in the UK during the 1980s it was slang that someone was "arrested on suss" - meaning on suspicion of being up to no good, carrying stolen goods or drugs, going equipped for crime, being involved in a crime that happened, loitering with intent to commit a crime.... something like that.

The connection to the first meaning is that the adjective something is sus(s) becomes used as a verb to suss, or to "suss out".