Divestment was a tactic used to good effect protesting trade with the apartheid regime in South Africa.  Bill McKibben of "350" called on American colleges and universities last year to divest themselves of investments in fossil fuel industries.  While it may not much matter to Exxon who holds its stock, this article points out that the fight for divestment is a way to get the attention of powerful members of Boards of Trustees.  And it is very fine to see college-age students energized on the important question of fossil fuel use.

http://www.nytimes.com/2013/07/09/science/old-tactic-in-new-climate-campaign.html?ref=science