The Illusive Man is more of a [censored] than I originally thought.
In ME3, you find out that he selected your team to project a friendly image of Cerberus. And if Kelly survives, you find out that she was leaking reports to the Illusive Man.
Okay, so in ME2, you get your new fancy ship! You check your emails. There's one from Captain Anderson, telling you to come see him on the Citadel. Huh, that's odd, how does he know?
So you go to the Citadel. And when asking about the Virmire Survivor, he's like "we can't tell you where they went! you're with Cerberus!"
(But I'm not working for Cerberus! They forced me to come along! I came to see you as soon as they let me!)
I originally thought that Tali emailed everyone going "hey! Shepard's alive!" but now I'm thinking that it was the Illusive Man who tipped everyone off.
Then you pick up your squadmates. One of them's your old buddy, Garrus. And convenient, the rest of his team got killed off by mercenaries, leaving him needing a rescue and more willing to come with you. In his loyalty quest, you find out that Sidonis betrayed him. But Sidonis was threatened by someone else to betray him...and we never find out who.
So, Kelly's ever-aware. Once he joins up, she notices that Shepard's a bit more relaxed than before. So she reports back to the Illusive Man about that.
Suddenly it's off to Horizon, where the Virmire Survivor is. The Illusive Man lured the Collectors there. Things between Shepard and the Virmire Survivor don't go so well, and Shepard's likely feeling bad again.
But hey! One of the new dossiers that comes up is for Tali! And convenient, the rest of her team got killed off by Geth, leaving her needing a rescue and more willing to come with you... (though I'm not sure how the Illusive Man would manage to tip off the Geth, so maybe my theory falls apart here)
And two more of the dossiers lead you to Illium, where Liara's hanging out being an information broker.
Annnd...I forgot where I was going with this.