Other people are doing it too... (so why aren't you doing it too, that would make you stand out...so join in, yes?)

Sharing an idea or advice. Wanting others to agree with you? If the advice comes from you, it seems obscure. The listener reaction is "ok....why should i listen to you?" But, if you can point out, quote or mention someone who has used your idea/advice and do well, the listener would be more receptive to your idea/advice. Suddenly, the idea doesn't sound so alien and more convincing. There's precedent.