We'll it's hard for me too choose i only use those two for these reason's:
1.I use facebook with my friends and family added and i use it too share and like and talk too my friends and family and see what the weather is a little or something funny or joining a group full of mlpfim fans or see what's happening on a news page.(We'll some people wanted me too add them but i did and i don't know why they wanted me too add them as friend maybe become my friend someday or we have stuff in common we'll i don't chat too them on facebook because simply i don't know them and my dad told me too stay off of facebook when i was 13 years old i belive he wanted me too be safe and i was stupid then but now my dad is ok with me on facebook and I'm not that stupid anymore and my dad got a facebook too and my mom and my two friends)
2,I use mlpforums too have a nice time and be helped and get too talk with bronies and pegausister's or if a female fan on mlpfim was a tomboy they would be called bropegasus or if some male fan of mlpfim was a tomgirl they would be called pegabrony.(I just combied thoese together if there was any tomboy and tomgirl fan of mlpfim it would sound good if there were named thoese)