According to a new study, marketers are increasingly nervous about moves Microsoft, Google and others are making, reports BizJournals, covering a Sapient study.

Keeping marketers up at night were purchases made by the big players of digital agencies and buying platforms. Also listed was the lack of faith marketers felt in their own agency's agility, with most saying it takes too long to make competitive changes and adjustments.

The Sapient Corp. study findings were released in an annual report of industry attitudes. The survey tapped 120 senior executives in agencies.

In terms of tracking ability, email and search campaigns were considered fairly easy to track, with 32 percent and 30 percent respectively confident in their ability to track such campaigns.

Social network campaigns, though, were identified as least easy to track.

That's not stopping the dollars, though, since that's also where the biggest channel increase is expected to occur in 2008.