The best replacement for hashtags is hashtags.

The best alternatives to hashtags are rated as following:
★★★★★  hashtags

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Speaking about hashtags, one probably shouldn't forget about most likes.

Other search terms related to hashtags and their ratings are:
★★★★★ most likes
★ instagram
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Google Trends

Scale is based on the average worldwide traffic of hashtags in all years. Click on graph for more.
hashtags
hashtags