Find the 4 groups of 4 Emojis connected by a common property.
The Emojis in each group may share a distinguishing characteristic in the name or in the appearance, or they may all relate to another English word. I made sure that visual similarities apply to all of the most common Emoji styles (Apple, Google, Twitter, etc.).
The table below shows the Unicode numbers of the Emojis used in the picture under their corresponding symbols (if supported by your browser).
$$ \begin{array}{|c|c|c|c|}\hline \huge 😃\atop\tt{U+1F603}&\huge 🎫\atop\tt{U+1F3AB}&\huge 🍺\atop\tt{U+1F37A}&\huge 💍\atop\tt{U+1F48D}\\\hline \huge 💺\atop\tt{U+1F4BA}&\huge 📖\atop\tt{U+1F4D6}&\huge 👭\atop\tt{U+1F46D}&\huge 🔓\atop\tt{U+1F513}\\\hline \huge 🐏\atop\tt{U+1F40F}&\huge 🐾\atop\tt{U+1F43E}&\huge 💿\atop\tt{U+1F4BF}&\huge 🍒\atop\tt{U+1F352}\\\hline \huge 🍩\atop\tt{U+1F369}&\huge 📬\atop\tt{U+1F4EC}&\huge 🔑\atop\tt{U+1F511}&\huge ⚔\atop\tt{U+2694}\\\hline \end{array} $$
Like in all connect wall puzzles, the purpose here is not finding arbitrarily many combinations of four that happen to share some common property, but finding distinct groups such that each element fits in exactly one group and no element is left out.
So far there have been a few brilliant guesses but no solution. I'll be posting hints if necessary.