Marketers say measuring ROI is the biggest challenge they face with their social media efforts, according to a recent report from Simply Measured and TrustRadius.

The report was based on data from a survey of nearly 600 social media practitioners that was conducted in February and March 2015.

Some 60% of respondents say measuring ROI is one of the most challenging aspects of their social program; other top challenges include tying social activities to business outcomes (50% cite), developing a social media strategy (48%), and securing enough internal resources (40%).