Loose river call?
 

No data on villain, just joined table.

Cryptologic 1.00/2.00 Hold'em <font color="#0000FF">(6 handed)</font> link

Preflop: Hero is Button with 8[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
UTG calls, MP calls, <font color="#666666">1 folds</font>, Hero calls, <font color="#666666">1 folds</font>, BB checks.

Flop: (4.50 SB) 7[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, MP checks, <font color="#CC3333">Hero bets</font>, BB folds, UTG calls, MP calls.

Turn: (3.75 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, MP checks, <font color="#CC3333">Hero bets</font>, UTG calls, MP calls.

River: (6.75 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">MP bets</font>, Hero calls, UTG folds.

Final Pot: 8.75 BB.

Re: Loose river call?
 

I would call it since villain may have put you on a flush draw and didn't want his pair checked through. Or he's got a 4. Call and hope to take it down.