For the purposes of Twitter, the best username is something short. Why? Twitter's 140-character limit. The shorter your name is, the less characters will be spent on addressing you if someone @replies or retweets you, and the more characters will be spent on valuable information. This means that people will be more likely to @reply or retweet you, and you'll become more popular on Twitter. Great.
If you are asking about choosing a twitter username for you,it is impossible until you give your name.
Well, it is always better that you use your own name as a user-name in Facebook. Because it not only does help other people but also for others to find you.
Shaylene kayla KAY KAY kit kat
@ng13 (Angie)
CMiranda. CarlosM.
maybe something like @Francisca_Francisca.
Kiel Brocks and Micse Lee
_drivemyLEXIS
there are some coll names of robot and one of them is Conrado
riley
Sora
Israelites
rimshotqq
Guys:SworddrawerAxemanKilljoyGirls:BitethemdogsSwordchichotdagger
krakow