<http://schema.org/alternativeHeadline>
"Facebook announces two-year stability guarantee for core APIs, SLA to fix all major bugs within 48 hours"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2014/04/30/facebook-announces-two-year-stability-guarantee-core-apis-sla-fix-major-bugs-within-48-hours/>