Thinking logic
Tobacco was invented in 5000 BC according to wikipedia. At that point in time it had basically none of the bad side effects you mention due to shorter life spans. It probably had numerous positive side effects.
Now you don't like facebook??? Well, honestly, I do. I like it to keep in touch with people and it had real value to me when I moved to a city where I didn't know a single person as it made me feel less alone. I'm sure many others have benefited.
Judging a startup, company, etc. because you don't see the value shows you are overly judgmental and immature.
The product market has been very good at delivering value over the last 7,000+ years. Let it do its job and try to get off your high horse.
The companies mentioned are highly successful. If you think you can do it, feel free to do it, donate the cash you make to Watsi and sit in your recliner while enjoying how good of a person you are. Otherwise, make a comment that adds value like the OP did.
Full disclaimer: I couldn't care less about any of the companies mentioned, I'm just sick of reading comments like this.
[edit] added an n't to could