[esspo]

Pre-Flop, I fold.

Flop, I agree with your friend. I don't like a bet becuase you are unlikely to take it down right there and you really don't want someone with a pair raising to protect their hand. If the board was less coordinated I would like a bet much more. But here the board is draw heavy with all medium cards. Its very unlikely a flop bet will take it down against 3 players in this unraised pot. If its checked to the button who bets I checkraise, otherwise I check/call.

Turn, after your bet is raised on the flop, calling is automatic.

River, I think its close between check/calling and check/raising mainly because you really don't have any idea how strong BB's hand is in this unraised pot. I don't think you should be worried about inducing a bluff. The fact that BB bet the turn after MP3's cold call suggests to me that BB has a made hand. In the heat of the moment I would probably check/call if MP3 called and check/raise if MP3 folded. You will almost always be paid off by a worse hand and its a safe fold if you are 3-bet.