A 'wide' question!
Forums (the original
social media) are really about networking
with your peers; interaction, giving advice, seeking help, brand building
. More here
. That's how you'll benefit mid-long term.
Sig links are all well and good but, as per the topic of this thread, if you never post no one know about you (or see those links).
There's a boat-load of info about how to make the most of UKBL here