This guy is an unknown and I only have about 10 on him. My stats say he's played a one or two hands, but I don't recall them.

Should we 3-bet in these spots or just call behind?

PokerStars No-Limit Hold'em, $0.10 BB (7 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Button ($5.95)
SB ($10)
BB ($9.85)
UTG ($10.20)
MP1 ($3.35)
MP2 ($9.50)
Hero (CO) ($10)

Preflop: Hero is CO with J, J
2 folds, MP2 bets $0.30, Hero raises to $0.90, 3 folds, MP2 raises to $9.50 (All-In), 1 fold

Total pot: $1.95 | Rake: $0