What have you bought through social media?

There come so many invitations for the seminars on social media marketing. I find such messages on my Twitter's timeline almost every day, every hour.
A seminar organizer emphasizes that social media easily promotes the sales of products and services. Sometimes such an organizer earns fee of the seminar itself, or they are watching eagerly for a chance to promote their consulting and tools even if the seminar is free.
However, looking back on myself, I have bought nothing through social media so far. How about are such people who are eager to join such kind of seminars? Have they bought anything through Twitter or Facebook?
If they haven't they had better review the advantages of social media, which budding missionaries have been advertising.
Be calm and think again.
Have social media marketers ever fascinated you?
What have you bought through social media?
Do you know anybody who bought something through Twitter?
Unfortunately I've never seen such a consumer so far.
That's why I don't trust the seminar organizers who emphasize the advantage of social media marketing.

from Tokyo