1st thing that'd tip you off is a changed password, but the "Warning" is only showed for a month
2nd thing, a change in style of writing
3rd , change in use of address.
And many more, you are asking this for "Educational purposes" right?
Yes, it's for educational purposes only. Its more to protect myself from such account users as I am into the riskiest trade possible using bitcoin.
Change is style of writing: What if I am not even aware about his real style of writing? How would I know that his writing is the same as it used to be?
Is it suggested to ask user to point the BTC address which they posted on the day they joined this forum before making any deal with them?
Different person has different writing style too
Take me for instance, i tend to post with dozens of emoticon
So maybe in the future when i don't post with emoticons anymore there's a possibility that this account is sold to someone else
You can determine if the account is sold or not by looking at the section they usually making post at
I saw an ID that posted a lot in Indonesian locals and suddenly he swifted to Italian section
But the best way to deal with scammers is by using escrow and always lool their trust before doing any transactions