add openrefine link

PublicDataLab · Sep 22, 2021 · 04ab9a0 · 04ab9a0
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@@ -15,6 +15,7 @@ A gathering of digital methods recipes and ["how-tos"](https://recipes.hypothese
 
 * [📈 Visualising hashtags over time with rankflow diagrams](/hashtag_rankflow.md)
 * [🧮 URL-Facebook Group networks](/url-facebook.md)
+* [🌪️💬 Filtering tweets based on hashtags](/filter_tweets_openrefine.md)
 
 # 🗃 Organising