Poker Stars $0.02/$0.05 No Limit Hold'em - 6 players - View hand 2148613
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BTN: $5.34 Has an avatar and is fully stacked. More likely regular.
SB: $7.93
BB: $6.95
UTG: $2.79
MP: $2.17
Hero (CO): $6.90
Pre Flop: ($0.07) Hero is CO with J 
A
2 folds, Hero raises to $0.15, BTN calls $0.15, 2 folds
Flop: ($0.37) K 
7 9 (2 players)
Hero bets $0.25, BTN folds
To c-bet or not to c-bet versus unknown.
Since the player is more likely to be a regular, I think he will be setmining a lot of the time. Since he is unknown he could have some suited cards but I assume that he will have pairs or air most of the time here so will have to fold.
I've got a couple backdoor draws which sweeten the deal.