John-Erik Koslosky

John-Erik Koslosky


Fool contributor John-Erik Koslosky has been picking his own stocks since the market crashed in 2008. He aims for a mix of value and growth, but mostly, just looks to buy great businesses.

Recent articles

Is Facebook's Instagram in Trouble?

A recent report shows falling user interaction rates on the red-hot social network. Is this a sign that Instagram is already losing steam?

The Single Most Important Number for Facebook

It won't generate headlines the way stellar growth on the top and bottoms lines do, but this metric is is an important measure of Facebook's long-term success.

Could This Be Sirius XM's Most Valuable Asset?

While investors focus on how well Sirius XM continues to add subscribers and grow revenue, it's easy to forget that the company is sitting on a very valuable asset that it's yet to put to use.

Facebook Is Out to Prove Its Ads Work

Digital advertising remains a murky world, where fraud lurks and measuring effectiveness has been elusive. Facebook wants to win over skeptical companies.