Check out the tweet history to see what I mean. They sent thousands of tweets from this account (and very possibly others), solely to get visibility for Siftery from the customers/others who search for the company's Twitter handle.
They take the same approach to other mediums. Regarding mholt’s comment, here’s another one: https://twitter.com/guusdk/status/909773952561696769
I can’t imagine ever trusting a company or person/team who does this.
Update: Here's another medium that Siftery spams, albeit at a lower volume - HN itself: https://news.ycombinator.com/submitted?id=ggiaco. ggiaco, an employee, submitted ~100 low-value Siftery pages about companies (rather than, say, the companies themselves, or sites he actually liked).
Update 2: Here's a second Twitter account, @SifteryFeed, which does the same thing as @SifteryHello: https://twitter.com/sifteryfeed. Example tweet:
> "Are you using Apache Hive (@TheASF) and recommend them? You can do it here http://siftery.com/some-landing-page … "