tough river spot with topset in 3bet pot

[TheLoon]

Villian is almost unknown. But seems LOOOOOOSE passive.
EverestPoker Game #2194502983: Table Dili-17 - $0.50/$1 - No Limit Hold'em - 14:07:07 - 2007/10/10
Seat 1: TheLoon ($129.60)
Seat 3: mathijs84 ($119.60)
Seat 4: Ice51 ($153.75)
Seat 5: diego2000 ($230.05)
Seat 6: sponge.bob ($95.50)
diego2000 posts the small blind of $0.50
sponge.bob posts the big blind of $1.00
The button is in seat #4
*** HOLE CARDS ***
Dealt to TheLoon[Qd Qh]
TheLoon raises to $3.50
mathijs84 folds
Ice51 folds
diego2000 raises to $11.50
sponge.bob folds
TheLoon calls $8.00
*** FLOP *** [Tc Qc 8d]
diego2000 checks
TheLoon bets $13.00
diego2000 calls $13.00
*** TURN *** [Tc Qc 8d] [Jd]
diego2000 checks
TheLoon checks
*** RIVER *** [Tc Qc 8d Jd] [4c]
diego2000 bets $50.00
TheLoon ????

He bets pot

[KingOfSwords]

Bet closer to the size of the pot on the flop. Bet the turn--at least half the pot. I like two-thirds or so. Remember that you have 10 outs to the boat on the river, in addition to already having top set.

edit: Forgot that he raised you preflop. This changes everything. You have to call the river. He either didn't like the flop, or he's attempting to slowplay AA or maybe TT for a lower set. You are crushing all but AK. You should be pumping the hell out of this pot on flop and turn. The river is a bit scary but I'm thinking this is a "better bet my set because he might not bet the river" bet on the end.

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Welcome to the boards.