I get malicious users signing up every now and then, bypassing the human/robot test I have in signup. I delete obvious ads and scams right away, but this was new:
A user signed up and posted kind of legitimate looking messages. However, he added a bad link and used HTML color to paint it transparent; only the underlines were visible. And since it is possible to have a web address looking link description and have it really pointing out to somewhere else (example: This is not CNN: www.cnn.com), do check that the link address pre-view of your browser actually points to something you want to click.
I guess this is basic web safety. Anyway, this is to remain you that this forum is not safe either, even though I try to make it so.