1. A computer-implemented method, comprising: running, by a processor, a plurality of classifiers on a web page to obtain one or more keywords, each classifier being previously determined based on positive and negative training examples; and selecting, by the processor, advertisements based on said one or more keywords.
1. A computer-implemented method, comprising: running, by a processor, a plurality of classifiers on a web page to obtain one or more keywords, each classifier being previously determined based on positive and negative training examples; and selecting, by the processor, advertisements based on said one or more keywords. 6. The computer-implemented method of claim 1 further comprising determining a classifier for each a plurality of keywords.