The warning came as Pearson reported full year results ahead of market expectations, with pre-tax profits for the year to 31 December growing 9% year on year, to £549m from £502m.
Pearson said that advertising revenues at the FT group had continued to grow in the early part of the year but remained "difficult to predict" amid the current uncertain market.
It reported, however, that ad revenues had increased at FT Publishing, the division which runs the FT, by 10% over 2007.
Pearson's uncertainty over the 2008 ad market follows last week's announcement by Trinity Mirror that volatility in the market had impacted on its revenues.
Meanwhile, Pearson said FT.com was performing well, following its decision to open up more of its content to non-paying customers in October last year.
It claimed the new model had led to 150,000 new registered users since October. It also revealed that FT.com had grown its number of monthly unique users by 30% to 5.7 million last year.
Pearson said that advertising revenues at the FT group had continued to grow in the early part of the year but remained "difficult to predict" amid the current uncertain market.
It reported, however, that ad revenues had increased at FT Publishing, the division which runs the FT, by 10% over 2007.
Pearson's uncertainty over the 2008 ad market follows last week's announcement by Trinity Mirror that volatility in the market had impacted on its revenues.
Meanwhile, Pearson said FT.com was performing well, following its decision to open up more of its content to non-paying customers in October last year.
It claimed the new model had led to 150,000 new registered users since October. It also revealed that FT.com had grown its number of monthly unique users by 30% to 5.7 million last year.
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