(Reuters) -Pinterest forecast fourth-quarter revenue slightly below Wall Street estimates on Tuesday, signaling rising competition from larger platforms such as Meta during the holiday shopping season. The company expects quarterly revenue between $1.31 billion and $1.34 billion, with the midpoint marginally below analysts' average estimate of $1.34 billion, according to data compiled by LSEG. Pinterest's results follow reports from digital ad bellwethers, including Google-parent Alphabet, Meta and Reddit, which posted upbeat third-quarter revenue on robust ad spending. Large platforms such as TikTok and Meta's Instagram and Facebook remain the top choices for marketers, thanks to their massive user bases and sophisticated artificial intelligence tools for campaign creation. The image shar

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