2.
Change I was suggested this app to This app was suggested me.
This app was suggested me by a younger friend.
3.
Change I was suggested this app to This app was suggested to me.
This app was suggested to me by a younger friend.
app (N) – application on a small handheld device
Indirect objects expressed as prepositional phrses: He explained the job to me. *He explained me the job.
He opened the door for me. *He opened me the door.