Flat calling with QQ preflop

[HoldEmNewby]

I saw it mentioned in a cardrunners video I think and a friend of mine mentioned it to me that i should be mixing it up with flatcalls and raises with QQ. Here are a couple hands, I'm quite lost though as to how to play them from the flop onward. Also if you don't like the scenario in which I'm flat calling preflop please elaborate (if you think i should never miss an opportunity to 3bet with QQ feel free to mention that as well). All the players I was flat calling were TAGS. Should I ever be flat calling unknowns or LAGS? It just seems like a bad idea to me but i could be wrong.

Party Poker, $0.50/$1 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

BTN: $145.04
SB: $261.78
Hero (BB): $100
UTG: $136.06
MP: $9
CO: $97

Pre-Flop: Q[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BB)
<font color="red">UTG raises to $3</font>, 4 folds, Hero calls $2

Flop: ($6.50) 6[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero ?????

Party Poker, $0.50/$1 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

UTG: $265.22
CO: $203.26
BTN: $128.78
SB: $193.38
Hero (BB): $100

Pre-Flop: Q[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] dealt to Hero (BB)
3 folds, <font color="red">SB raises to $4</font>, Hero calls $3

Flop: ($8) 2[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">SB bets $5</font>, Hero????

Party Poker, $0.50/$1 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

BB: $125.81
UTG: $128.68
CO: $55.55
BTN: $97
Hero (SB): $99

CO posts $1
Pre-Flop: Q[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] dealt to Hero (SB)
<font color="red">UTG raises to $5</font>, 2 folds, Hero calls $4.50, BB folds

Flop: ($12) 2[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/club.gif[/img] (2 Players)
Hero????