PokerStars Zoom, Hold'em No Limit - $0.01/$0.02 - 6 players
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UTG (Hero): $2.00 (100 bb)
MP: $2.53 (127 bb)
CO: $2.12 (106 bb)
BU: $0.84 (42 bb)
SB: $2.00 (100 bb)
BB: $2.00 (100 bb)

Pre-Flop: ($0.03) Hero is UTG with T♦ T♣
Hero raises to $0.06, 1 fold, CO 3-bets to $0.18, 3 players fold, UTG (Hero) folds

Tough decision, specially in zoom games. You generally don't have any information in your opponent. Your play is good, as would be fair to call and bet again depending on the board. But to be honest, I would fold too.

This is a little bit to tight, unless you have a HUD running and a big sample telling you, that the opponent is very nitty. If his VPIP/PFR is something like 17/14 with a 3-bet of 4%, you can make an exploit and fold TT to his 3-bets, especially when you opened from the first 2 seats at a 6-max table. But against an unknown you have to defend with TT.